Check your armory and the other various inventory systems.
Your profile shows you have a level 90, I can't think of any items getting removed from the game since EW so it's probably not that.
Depending on what happened during your hiatus your saved gearsets might simply be looking for items you have since replaced, like if you've restored your saved settings from a backup that wasn't quite up to date.

If the items are gone and you haven't mistakenly gotten rid of them yourself check your account for foreign logins because short of those options I can't think of anything.